Kim lauds S Korea

North Korea leader Kim Jong Un expressed satisfaction over his archrival South Korea.

South Korea's hosting of the Winter Olympics has sparked a sudden and rare moment of rapprochement across the Demilitarized Zone after months of sky-high tensions over Pyongyang's rapidly advancing nuclear weapons programme and bellicose missile tests.

Kim Jong Un praised South Korea as very impressive, state media reported Tuesday, after his sister and other top regime officials returned from their landmark visit to the Winter Olympics.

"After receiving the delegation's report, Kim Jong Un expressed satisfaction over it and said that very impressive were the features of the south side which specially prioritised the visit of the members of the DPRK side who took part in the Winter Olympics," KCNA said, adding the North Korean leader "expressed thanks" to Seoul.

After months of rebuffing invitations from South Korea to attend the Olympics, Kim did an about-face in a New Year speech, AFP reports.

The North has since sent its athletes to the South Korean ski resort of Pyeongchang, along with cheerleaders and performers, and dispatched a diplomatic delegation that included Kim's sister Kim Yo Jong.

She became the first member of the North's ruling dynasty to set foot in the South since the end of the Korean War.

She shook hands several times with the South's President Moon Jae-in, cheered a unified ice hockey team with him, and conveyed her pother's invitation to a summit in Pyongyang.

'Warm climate'

The KCNA report suggested the North Korean leader wished to build on that rapprochement, saying he felt it "is important to continue making good results by further livening up the warm climate of reconciliation and dialogue".

The report added that Kim "set forth in detail the orientation of the improvement of the north-south relations and gave important instructions to the relevant field to take practical measures for it," without detailing what those measures were.

The KCNA report is the first official reaction from Kim -- the third generation of her family to rule the isolated and impoverished North -- since his sister's charm offensive in Pyeongchang.

Every detail of her visit as the key member of a diplomatic delegation to the South's Winter Olympics was scrutinised, from the clothes she wore and her facial expression to the bag she was carrying and even her handwriting.

Her visit divided South Koreans with some hoping it might usher in a real opportunity for reconciliation while others angrily burned the North Korean flag and criticised Moon for being too soft on Pyongyang.

The speed of the Olympics-driven rapprochement across the Demilitarized Zone that has divided North and South since the end of the Korean war has been extraordinary.

But how deep it runs, how far it will go and how long it will last once the Games are over remain very open to question, analysts say.

Pyongyang's Olympic diplomacy has also highlighted differences between Seoul and its key protector the United States over how to handle the reclusive regime and its nuclear weapons programme.

Washington insists that Pyongyang must take concrete steps towards denuclearisation before any talks can begin, while Moon -- whose parents escaped from the North in a US evacuation during the war -- has long argued for closer involvement to ping it to the negotiating table.